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You know what, I need a break from this place anyways, so I'll go ahead and say something I've wanted to talk about for a while but never been able to.
So Sena/Senna was her nickname as HER, and she also had an account with the name Sen Leaf. Sen leaf and senna can refer to Senna alexandrina and other similar plants and their extracts, which are used as an herbal laxative.
So her nickname was literally a poop joke. She's always been a fart shark. OK, see ya.